Help what instrument is this

I love questions like this.  I listened to it and couldn’t tell what it was, so I did some research.  I think it may be an early analog synth called a mellotron. Check these sounds and let me know
https://youtu.be/JO0ZcD-kfdE
https://youtu.be/ByD8gH7kYxs     

it does sound like a mellotron, but there was another "early synth" at the time called a string machine? nice song,  early multi track recording; record in mono then mix into stereo as the beatles did late 60's. thanks for bringing this up.     

The Mellotron was an early attempt to bring a string section along on tour (or into a recording) without having to hire a string section. Other keyboardists who used it extensively were Tony Banks (Genesis), Rick Wakeman (Yes), Mike Pinder (Moody Blues), and Manfred Mann (Earth Band). I heard an interview with Wakeman once, and he commented on how poorly they traveled, and required constant setup / adjustments to keep them working.     

Guitar synth maybe? They've come a long way since the 80's. I remember seeing the Yardbirds with Clapton playing a Strat which sounded like a violin.
I also remember a McCartney interview during the Wings time, they used a mellotron which constantly required retuning. mellotrons used magnetic tape so I guess they'd stretch? The Beatles did use one on Strawberry Fields and Genesis used it a lot on Nursery Crime to mention but a few.